how can i make suer to get that upgrade?

just found fiery axe of foritude
how can i salvage it to get the fort and not the fiery.

Nothing short of divine intervention will get you 100% rate of salvaging the desired component. The only thing you can do is hope, if you try. There is always a chance of getting the unwanted mod.

Or iron ingots.

I find crossing the toes on my left foot seems to help.

It has been my experience that prefix mods (fiery, sundering, etc.) tend to salvage more than suffix ones, but I have no empirical data to support that claim.

Rico

I, on the other hand, find suffix mods to be more common from salvaging items Luck of the draw I guess, sometimes its worthwhile just selling the entire item, let someone else take the chance

Simple, really. You build a time machine, and if you fail to get the right mod, you rewind time and try it again. I find divine intervention works pretty well too. Maybe you should ask a monk to do it?

Really the only thing you can do is pray. And make sure you're using the expert salvage kit, not the normal one.

If you figure it out let me know ... just salvaged an icy axe of enchantment with 20% enchantment ... got the ice.